JPH0377732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dust suction pipe such as an extension pipe in a vacuum cleaner used in general households, and particularly to a pipe connection structure thereof.

Prior Art FIG. 6 shows a pipe connection part of a conventional dust suction pipe. That is, a double tube section 2 is formed at the end of the tube body 1, and inner and outer tube sections 3 and 4 of the double tube section 2 are formed at the end of the tube body 1.
A locking body 6 is arranged in the space 5 between them. This lock body 6 connects and connects the inner tube portion 3 with another tube body fitted therein or with an insertion tube portion 7 of a suction nozzle, and protrudes outward from the operation hole 8 of the outer tube portion 4. a pair of elastic legs 11 that protrude from the operation button 9 to both sides and whose tips abut against the stopper 10; It consists of a claw 14 that passes through the through hole 12 and engages with a locking recess 13 on the outer periphery of the insertion tube section 7. Each leg piece 11 of the lock body 6 is set in a straight line or a substantially straight line in a free state, and is bent into an arc shape and inserted into the space 5.
Therefore, under normal conditions, these leg pieces 11 are in a tensioned state with the stopper 10 and the operation button 9 in contact with the lower hole edge of the operation hole 8 of the outer tube section 4 as the base points, thereby preventing the legs from being attached inward. It is generating power. That is,
Due to the biasing force of this leg piece 11, the claw 14 is attached to the inner tube part 3.
The locking recess 13 of the insertion tube part 7 passes through the through hole 12 of
It is designed to ensure that it engages securely.

Problems to be Solved by the Invention In the conventional configuration described above, when removing the insertion tube section 7 from the inner tube section 3, the operation button 9 is pushed to deform each leg piece 11 so as to bulge outward. As the leg piece 11 deforms, the claw 14 also displaces outward and separates from the locking recess 13 of the insertion tube part 7.

By the way, in order to ensure the connection between the inner tube section 3 and the insertion tube section 7, the biasing force of the leg piece 11 must be increased to some extent. However, when the biasing force is increased, force is required to displace each leg 11 outward as the operation button 9 is pushed, resulting in poor operability. In other words, the conventional device had a problem in that connection reliability and improved operability were not compatible with each other.

The present invention solves these conventional problems and provides a dust suction tube having a tube connection structure that maintains good connectivity and improves operability.

Means for Solving the Problems In order to solve the above conventional problems, the present invention has the following features:
A pipe body having a double pipe part at the end, another pipe main body or an insertion pipe part of a suction nozzle that is fitted into the inner pipe part of the double pipe part, and of the double pipe part, A lock body is provided in the gap between the outer tube parts, and the lock body includes an operation button that protrudes outward from an operation hole formed in the outer tube part of the double tube part, and a lock body that extends from the operation button. A pair of legs protruding from each other and having an elastic force for constant displacement inward, and a pair of legs formed on each of these legs, passing through the through hole of the inner tube part and into the locking recess on the outer periphery of the insertion tube part. It consists of an engaging pawl, and a fulcrum protrusion is formed on the outer periphery of the inner tube corresponding to a part of the leg between the pawl and the operation button.

Function In the configuration of the present invention described above, when the operation button is pressed, the leg pieces expand outward while being displaced in the same pressing direction. Here, part of the leg piece hits the fulcrum projection,
Its action promotes its outward expansion. Therefore, the leg piece can be deformed rationally using the operation button.

Example Examples thereof will be described below with reference to the accompanying drawings.

In FIGS. 1 to 5, reference numeral 21 denotes a vacuum cleaner, which sucks and collects dust sucked by a suction nozzle 22 through two dust suction pipes 23 and a hose 24. The two dust suction tubes 23 have the same configuration, and the connection configuration between them and the connection configuration with the suction nozzle 22 are also the same. In the following explanation, the connection configuration between the two dust suction tubes 23 will be explained. Let's take this as an example.

The tube body 25 of the dust suction tube 23 is obtained by joining semi-cylindrical tube members 25a and 25b made of synthetic resin, and an insertion tube portion 26 is integrally formed on one of the tube members 25a and 25b. On the other hand, a tube member 27 having a large diameter and made of a separate member is clamped and fixed. That is, the other tube body 25 has a double tube section 28 formed by the tube member 27 described above. 29 is the tube body 25
This is a lead wire passed through the vacuum cleaner 21 to supply electricity from the vacuum cleaner 21 when the suction nozzle 22 has a built-in electric brush. The insertion portion of the lead wire 29 is a rib 3 protruding from one pipe member 25b.
0 to the dust suction passage.

Now, the double tube section 28 has an inner tube section, an outer tube section 31,
A space 33 exists between 32, and a lock body 34 is disposed in this space 33. The lock body 34 connects the inner tube portion 31 and the insertion tube portion 26 of the other tube body 25 that fits inside the inner tube portion 31.
An operation button 36 that protrudes outward from an operation hole 35 formed in the outer tube part 32 and a pair of elastic legs 38 that protrude from the operation button 36 to both sides and whose tips abut against a stopper 37 are combined. It is obtained by integrally molding it with resin. The insertion tube portion 2 is inserted through the through hole 39 of the inner tube portion 31 into the inner surface of the central portion of each leg piece 38.
6. A claw 41 that engages with a locking recess 40 on the outer periphery is provided in a protruding manner. Further, a fulcrum protrusion 42 corresponding to a part of the leg piece 38 is formed slightly above the through hole 39 of the inner tube part 31.

Reference numeral 43 indicates a sealing material adhered to the outer surface of the hole edge of the through hole 39.

In addition, the inner tube part 31 is offset downward from its outer circumference so that the effective volume of the space 33 will not be reduced even if the fulcrum protrusion 42 is formed.

In the free state, each leg 38 of the lock body 34 is set in a straight line or a substantially straight line, and is inserted into the space 33 in an arcuate manner. Therefore, under normal conditions, these leg pieces 38 are in a tensioned state with the stopper 37 and the operation button 36 in contact with the lower hole edge of the operation hole 35 of the outer tube section 32 as base points, thereby causing inward movement. A biasing force is generated. That is, the claw 41 is engaged and held in the locking recess 40 of the insertion tube section 26 through the through hole 39 of the inner tube section 31 by the biasing force of the leg piece 38 .

In the above configuration, FIG. 2 shows the connection state of the insertion tube section 26 to the inner tube section 31, and as mentioned above, the claw 41 is connected to the inner tube section 31 by the elasticity of the leg piece 38.
The locking recess 40 of the insertion tube portion 26 is inserted through the through hole 39 of
is engaged in. Here, the leg piece 38 closes the through hole 39 via the sealing material 43 to perform air tightness. In particular, when the vacuum cleaner 21 is operated with this configuration, suction force acts on the leg piece 38, and in addition to its own elasticity, the suction displacement force functions as a pressing force against the sealing material 43, and the through-hole Improve air tightness in the 39 part.

Next, when removing the insertion tube part 26, use the lock body 34.
Press the operation button 36. Here, as the operation button 36 is pressed, the leg piece 38 is displaced downward as a whole and expands outward, but the part of the leg part 38 hits the fulcrum protrusion 42 and this action also causes an outward expanding force. receive.

Therefore, in addition to the outward displacement force exerted by itself, the leg pieces 38 are also subjected to two forces, thereby easily deforming outward. Claw 41
is released from the locking recess 40 by the above operation, and the insertion tube section 26 can be pulled out from the inner tube section 31 (see FIGS. 1 and 3).

Note that the above connection configuration is the same between the dust suction pipe 23 and the insertion pipe portion 26 of the suction nozzle 22.

Effects of the Invention As described above, the present invention forms a fulcrum protrusion on the inner tube part to promote the outward expansion of the leg pieces when the operation button of the lock body is pressed. Even if the connecting force is strengthened by increasing the biasing force of the leg pieces, the connection and disconnection operation can be easily performed, and the usability can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a main part of a connecting part showing an embodiment of the present invention, FIG. 2 is a sectional view in a connected state, FIG. 3 is a sectional view when disconnected, and FIG. 4 is an exploded perspective view. FIG. 5 is an overall perspective view, and FIG. 6 is a sectional view showing a conventional example. 22... Floor nozzle, 25... Pipe body, 26...
Plug-in pipe part, 28...double pipe part, 31...inner pipe part,
32...Outer tube part, 33...Space, 34...Lock body, 35...Operation hole, 36...Operation button, 38...
Leg piece, 39... Through hole, 40... Locking recess, 41...
...Claw, 42...Protrusion for fulcrum.

Claims (1)

[Claims] 1 A pipe body having a double pipe part at the end, another pipe main body or an insertion pipe part of a suction nozzle that is fitted into the inner pipe part of the double pipe part, and an inner pipe part of the double pipe part. , a lock body disposed in the gap between the outer tube parts, and the lock body includes an operation button protruding outward from an operation hole formed in the outer tube part of the double tube part, and a lock body disposed in the gap between the outer tube parts. 1, which is more protruding and has an elastic force that constantly displaces inward.
It is composed of a pair of leg pieces and a claw formed on each leg piece, which penetrates the through hole of the inner tube part and engages with the locking recess on the outer periphery of the insertion tube part, and the claw and the operation button. A dust suction tube for a vacuum cleaner in which a fulcrum protrusion is formed on the outer periphery of the inner tube corresponding to a part of the leg piece between the legs.